Split pulley



(No Model.)

H. BURNHAM. SPLIT PULLBY.

No. 422,568. Patented Mar, 4, ,1890.

UNITED STATES i" ATENT OFFICE.

sP L|T PULLEY.

SPCIFICATION forming part of Letters Patent No; 422,568, dated March 4, 1890.

v Application filed October 4, 1889. I Serial No. 326,000. (No model.)

T aZZ witam, it may concrn:

Be it knownthat I, I-IlRAM URNHAM, a citizen of the United States, residing at Burnhams, in the county ofChautauqua and State of New York, havc-invented a new and use-` ful Split Pulley, of which the following is a specification.-

This invention rclates to split pulleys, and

v-itv-has for its 'objects to provide a split pulley in which the hub as welLas the rim and v spokes shall beconstructed of wood and in a very strong, `durablc,. and econoinical manne'r. i

The invention consists in thc improved construction, arrangenient, and combination of parts, which will be he'reinafterl fully vdescribed, and particularly pointed out in-'the' claiins.

In the drawings hereto annexed, Figure 1 is a perspective view of my improved split pulley, showing the same equipped withdifferent kinds of spokes. Fig..2 is a perspective view showing one half of the paiiey separated from the' other half. Fig. f'fis a trans- Verse sectional view of 'the pulley. s Figs. 4,

enabling the meeting ends of the sections 1 1n to be securely connected by means of transverse bolts 3. The segmental strips 2 2 are to be connected together in any suitable mauner by means of bolts, glue, or in any convenient well-known manner.

The hub of the ipulley is composed of two series of blocks 4 4'1, as shown in Figs. land .3 of the d'rawings, which are of a thickness eqnal to that of the strips 2, of which the'sections of the rim are composedt These blocks are provided in their inner or meeting faces with semi-cylindrical reces'ses -5 to receive the shaft'. The spokes 7, which are formed integrally with the bloeks and 41, may extend from the'sides of said blocks eitherv radially or obliq'uely vto the rim. of the pulley, as

p shown respeotively in Figs. 4 and 5 of the drawings, or a single block may have two spokes extending from its ends to the rim of p the pulley, as shown in Fig. 6. It is ohvious that in either case the construction should be such that thegrain of the Wood will runv longitudinally through the spokesin order to insure the requisite degree of strength. The spokes are to be formed with sharp or heveled cdges, so as to present the least possible resistance to the-atmosphere, thus avoiding an objection common to -most pulleys which are provided with wooden' spokes.

In the make-up of the hubs several blocks without spokes vmay also, when desired, be employed for the .purpose of -properly spacing the blocks-having the spokes, or for making each Semi-hub of the proper width. One such block is shown'- at -tbj The blocks tand 4*, composing each of the' Semi-hubs, are to be connected bytransverse bolts 8, which bind them firmly together. In small pulleys it may be found suficient to use hubs in which the spokes extend. from` the ends of the blocks, thus running transversely across the pulley parallel to .each other; but in larger pulleys, I proposein addition to these to use spokes extending radiallyand obliquely from the hub, in order ,to brace all parts of the circumference of the rim. Specimensiof the several types of spokes herein described have been shown in Figs. 1 and 2 of the drawings.

For the reception of the enter ends of the spokes, which are made of a thickness equal v to that of the strips 2,' composing the rim, the said strips are arranged with suflicient spaces `between their meeting ends to accommodate -the ends of the spokes. The latter are then firmly secured in the rim by means of bolts, pins, or plugs 9 extending transversely through the latter.l

Adjacent to the outer sidesl of the blocks composing theV Semi-hubs, and transversely across-the latter, are placed plates or clips 10, having perforated envds to receive the bolts 12,'wl1ich serve, in'addition-to the -bolts 3,-to connect the Sections 1 and 1* of the pulley together, but more especially-toclamp the pulley tightly upon the shaft 6 in position for Operations. To fit the'v pulley upon the shaft, in case the Iatter is v,of too small diam- IOO eter to fit the recesses 5 in the hub-sections, I interpose bushings 13 of bent Wood or veneer, which may be cut very thin 01' of any desired thickness, and which are snfficiently iiexible to be very easily and accurately fitted, and which, moreover, have the very important advantage of being suflicientiy eiastic-to bind very firmly upon the shaft, thereby enabling the puiley to be very easily mounted with suflicient rigidity to prevent it from slipping.

The operation of my invention and its advantages will be readily understood from the foregoing description, taken in connection 'with the drawings hereto annexed. My improved split pniley is very simple and inexpensive in construction,and at the same time it Will be found to possess theimportant qualities of strength, I'ightness, and dnrability in a very extraordinary degree. This I consider due to the fact that the spokes are made integrally with the hub, whereby joints are avoided which are easily strained and putout of Shape, the strain in my improved pulley bein'g direct from the shaft to the rim. I also avoid the use of castings, which are not only easily broken, but which tend'to injure the Wooden pa'rts With which they come in contact, and With the sole exception of bolts and clipplates my improved pulley is manufactured whoily of Wood. The clip-plates are used to avoid piercing, and thns Weakening the Wood.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In a split puiley, the blocks composing the Semi-hubs, said blocks `being arranged in layers and having spokes formed integraiiy therewith and extending from their ends and radiaiiy and obiiquely from their sides with the grain of the Wood running longitudinaily through saidspokes, substantiaily as and for the purpose set forth.

2. In a split pulley, the blocks composing the Semi-hubs, said blocks being arranged in Iayers and having spokes formed integraily therewith and extending from their ends and radiaily and obliquely from their sides With the grain of the Wood running longitudinaliy through said spokes, in combination with the rini composed' of segmental strips of Wood of equal thickness to the blocks composing the hubs and spokes, the ends of said spokes being fitted'and secured between the meeting ends of the strips forming the rim, substantially as set forth.

3. A split pulley comprising the rim-sections composed of segmental strips having lapjointed meeting ends connected by transverse bolts, the semi-hubs composed of layers of wooden blocks connected by transverse bolts and having semi-cylindrical recesses in their meeting faces, the 'spokes formed integraiiy with said blocks and having their outer ends itted between the meeting ends of the strips forming the rim-sections, the clip-plates arranged adjacent to the outer sides of the bloeksxforming the hub-Sections transversely across the latter, and the connecting-bolts, substantially as and for the-purpose setforth.

Intestimon y that I claim the foregoing as' my own I have hereto aflixed my signature in presence of two witnesses.

HIRAM BURNHAM. Witnesses:

THOMAS GRANE, E. J. BADGER. 

